Shiva is one of the four primeval gods, and his jurisdiction is Destruction. He disappeared after the Cataclysm along with Visnu. He was the former patron of the 11th month, but that honor has gone to Marut since the year N0.
Shiva and Vishnu both went missing in the year N0, and Kali disappeared many years earlier. There has been no explanation yet as to what happened to the three of them. Brahma is the only primeval god remaining active in the universe.